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<h1 id="firstHeading" class="firstHeading">Date and time utilities</h1>
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</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div><div class="t-navbar-head"><strong class="selflink"> Date and time utilities</strong><div class="t-navbar-menu"><div><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv-h1"><td colspan="5"> Functions</td></tr>
<tr class="t-nv-h2"><td colspan="5"> Time manipulation</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="chrono/difftime.html" title="c/chrono/difftime"><span class="t-lines"><span>difftime</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="chrono/time.html" title="c/chrono/time"><span class="t-lines"><span>time</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="chrono/clock.html" title="c/chrono/clock"><span class="t-lines"><span>clock</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="chrono/timespec_get.html" title="c/chrono/timespec get"><span class="t-lines"><span>timespec_get</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="chrono/timespec_getres.html" title="c/chrono/timespec getres"><span class="t-lines"><span>timespec_getres</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c23">(C23)</span></span></span></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Format conversions</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="chrono/asctime.html" title="c/chrono/asctime"><span class="t-lines"><span>asctime</span><span>asctime_r</span><span>asctime_s</span></span></a></div><div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-c23">(C23)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="chrono/ctime.html" title="c/chrono/ctime"><span class="t-lines"><span>ctime</span><span>ctime_r</span><span>ctime_s</span></span></a></div><div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-c23">(C23)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="chrono/strftime.html" title="c/chrono/strftime"><span class="t-lines"><span>strftime</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="chrono/wcsftime.html" title="c/chrono/wcsftime"><span class="t-lines"><span>wcsftime</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c95">(C95)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="chrono/gmtime.html" title="c/chrono/gmtime"><span class="t-lines"><span>gmtime</span><span>gmtime_r</span><span>gmtime_s</span></span></a></div><div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-c23">(C23)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="chrono/localtime.html" title="c/chrono/localtime"><span class="t-lines"><span>localtime</span><span>localtime_r</span><span>localtime_s</span></span></a></div><div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-c23">(C23)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="chrono/mktime.html" title="c/chrono/mktime"><span class="t-lines"><span>mktime</span></span></a></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> Constants</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="chrono/CLOCKS_PER_SEC.html" title="c/chrono/CLOCKS PER SEC"><span class="t-lines"><span>CLOCKS_PER_SEC</span></span></a></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> Types</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="chrono/tm.html" title="c/chrono/tm"><span class="t-lines"><span>tm</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="chrono/time_t.html" title="c/chrono/time t"><span class="t-lines"><span>time_t</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="chrono/clock_t.html" title="c/chrono/clock t"><span class="t-lines"><span>clock_t</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="chrono/timespec.html" title="c/chrono/timespec"><span class="t-lines"><span>timespec</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div></td></tr>
</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div></div>
<h3><span class="mw-headline" id="Functions">Functions</span></h3>
<table class="t-dsc-begin">

<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Time_manipulation">  Time manipulation </span></h5>
</td></tr>

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;time.h&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="chrono/difftime.html" title="c/chrono/difftime"> <span class="t-lines"><span>difftime</span></span></a></div></div>
</td>
<td>   computes the difference between times <br> <span class="t-mark">(function)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="chrono/time.html" title="c/chrono/time"> <span class="t-lines"><span>time</span></span></a></div></div>
</td>
<td>   returns the current calendar time of the system as time since epoch <br> <span class="t-mark">(function)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="chrono/clock.html" title="c/chrono/clock"> <span class="t-lines"><span>clock</span></span></a></div></div>
</td>
<td>   returns raw processor clock time since the program is started <br> <span class="t-mark">(function)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="chrono/timespec_get.html" title="c/chrono/timespec get"> <span class="t-lines"><span>timespec_get</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div>
</td>
<td>   returns the calendar time in seconds and nanoseconds based on a given time base  <br> <span class="t-mark">(function)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="chrono/timespec_getres.html" title="c/chrono/timespec getres"> <span class="t-lines"><span>timespec_getres</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c23">(C23)</span></span></span></div></div>
</td>
<td>   returns the resolution of calendar time based on a given time base  <br> <span class="t-mark">(function)</span> </td></tr>

<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Format_conversions">  Format conversions </span></h5>
</td></tr>

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;time.h&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="chrono/asctime.html" title="c/chrono/asctime"> <span class="t-lines"><span>asctime</span><span>asctime_r</span><span>asctime_s</span></span></a></div><div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-c23">(C23)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div>
</td>
<td>   converts a <span class="t-lc"><a href="chrono/tm.html" title="c/chrono/tm">tm</a></span> object to a textual representation <br> <span class="t-mark">(function)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="chrono/ctime.html" title="c/chrono/ctime"> <span class="t-lines"><span>ctime</span><span>ctime_r</span><span>ctime_s</span></span></a></div><div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-c23">(C23)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div>
</td>
<td>   converts a <span class="t-lc"><a href="chrono/time_t.html" title="c/chrono/time t">time_t</a></span> object to a textual representation <br> <span class="t-mark">(function)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="chrono/strftime.html" title="c/chrono/strftime"> <span class="t-lines"><span>strftime</span></span></a></div></div>
</td>
<td>   converts a <span class="t-lc"><a href="chrono/tm.html" title="c/chrono/tm">tm</a></span> object to custom textual representation <br> <span class="t-mark">(function)</span> </td></tr>

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;wchar.h&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="chrono/wcsftime.html" title="c/chrono/wcsftime"> <span class="t-lines"><span>wcsftime</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c95">(C95)</span></span></span></div></div>
</td>
<td>   converts a <span class="t-lc"><a href="chrono/tm.html" title="c/chrono/tm">tm</a></span> object to custom wide string textual representation <br> <span class="t-mark">(function)</span> </td></tr>

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;time.h&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="chrono/gmtime.html" title="c/chrono/gmtime"> <span class="t-lines"><span>gmtime</span><span>gmtime_r</span><span>gmtime_s</span></span></a></div><div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-c23">(C23)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div>
</td>
<td>   converts time since epoch to calendar time expressed as Coordinated Universal Time (UTC) <br> <span class="t-mark">(function)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="chrono/localtime.html" title="c/chrono/localtime"> <span class="t-lines"><span>localtime</span><span>localtime_r</span><span>localtime_s</span></span></a></div><div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-c23">(C23)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div>
</td>
<td>   converts time since epoch to calendar time expressed as local time <br> <span class="t-mark">(function)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="chrono/mktime.html" title="c/chrono/mktime"> <span class="t-lines"><span>mktime</span></span></a></div></div>
</td>
<td>   converts calendar time to time since epoch <br> <span class="t-mark">(function)</span> </td></tr>
</table>
<h3><span class="mw-headline" id="Constants">Constants</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;time.h&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="chrono/CLOCKS_PER_SEC.html" title="c/chrono/CLOCKS PER SEC"> <span class="t-lines"><span>CLOCKS_PER_SEC</span></span></a></div></div>
</td>
<td>   number of processor clock ticks per second <br> <span class="t-mark">(macro constant)</span> </td></tr>
</table>
<h3><span class="mw-headline" id="Types">Types</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;time.h&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="chrono/tm.html" title="c/chrono/tm"> <span class="t-lines"><span>tm</span></span></a></div></div>
</td>
<td>   calendar time type <br> <span class="t-mark">(struct)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="chrono/time_t.html" title="c/chrono/time t"> <span class="t-lines"><span>time_t</span></span></a></div></div>
</td>
<td>   calendar time since epoch type <br> <span class="t-mark">(typedef)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="chrono/clock_t.html" title="c/chrono/clock t"> <span class="t-lines"><span>clock_t</span></span></a></div></div>
</td>
<td>   processor time since era type <br> <span class="t-mark">(typedef)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="chrono/timespec.html" title="c/chrono/timespec"> <span class="t-lines"><span>timespec</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div>
</td>
<td>   time in seconds and nanoseconds  <br> <span class="t-mark">(struct)</span> </td></tr>
</table>
<h3><span class="mw-headline" id="References">References</span></h3>
<div class="t-ref-std-17">
<ul><li> C17 standard (ISO/IEC 9899:2018): 
</li></ul>
<dl><dd><ul><li> 7.27 Date and time &lt;time.h&gt; (p: 284-291)
</li></ul>
</dd></dl>
<dl><dd><ul><li> 7.29.5.1 The wcsftime function (p: 320-321)
</li></ul>
</dd></dl>
<dl><dd><ul><li> 7.31.14 Date and time &lt;time.h&gt; (p: 333)
</li></ul>
</dd></dl>
</div>
<div class="t-ref-std-11">
<ul><li> C11 standard (ISO/IEC 9899:2011): 
</li></ul>
<dl><dd><ul><li> 7.27 Date and time &lt;time.h&gt; (p: 388-397)
</li></ul>
</dd></dl>
<dl><dd><ul><li> 7.29.5.1 The wcsftime function (p: 439-440)
</li></ul>
</dd></dl>
<dl><dd><ul><li> 7.31.14 Date and time &lt;time.h&gt; (p: 456)
</li></ul>
</dd></dl>
</div>
<div class="t-ref-std-c99">
<ul><li> C99 standard (ISO/IEC 9899:1999): 
</li></ul>
<dl><dd><ul><li> 7.23 Date and time &lt;time.h&gt; (p: 338-347)
</li></ul>
</dd></dl>
<dl><dd><ul><li> 7.24.5.1 The wcsftime function (p: 385-386)
</li></ul>
</dd></dl>
</div>
<div class="t-ref-std-c89">
<ul><li> C89/C90 standard (ISO/IEC 9899:1990): 
</li></ul>
<dl><dd><ul><li> 4.12 DATE AND TIME &lt;time.h&gt; 
</li></ul>
</dd></dl>
</div>
<h3><span class="mw-headline" id="See_also">See also</span></h3>
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